It never seems to work out for us, since we’ll be work hard for 8 hours and then start wondering what our friends are up to, or start surfing the net for no apparent reason.
8 hours of productivity in a day sounds like a healthy work-life balance to me. You're just frustrated because you're not getting rich yet.
I'm starting to think I should open 'code jail' where programmers will pay me for the privilege of being dragged out of bed at 6am, given a pep talk, nutritious but unexciting meals at 6 hourly intervals, with one hour of forced exercise per day and limited opportunities for social interaction. Basically, I'll be like an extremely abusive boss/prison guard, but you retain the intellectual property for whatever you create while you're in code jail. Or boot camp, or whatever I decide to call it. You can pay me up front or give me 1% of the equity for every week of iron discipline.